Looking for online definition of PO or what PO stands for? PO is listed in the World’s most authoritative dictionary of abbreviations and acronyms. Join Pogo Games for endless online fun! With 60+ exciting games, from classics to new hits, Pogo has been delivering entertainment for over 20 years. This page illustrates how PO is used in messaging and chat forums, in addition to social networking software like VK, Instagram, Whatsapp, and Snapchat. From the table above, you can view all meanings of PO : some are educational terms, the other are medical terms, and even computer terms. What does the abbreviation PO stand for? Meaning: by mouth; orally. Looking for the definition of PO ? Find out what is the full meaning of PO on Abbreviations.com! ‘Post Office’ is one option — get in to view more @ The Web’s largest and most authoritative acronyms and abbreviations resource. 102 definitions of PO . Meaning of PO. What does PO stand for? PO abbreviation . Define PO at AcronymFinder.com. PO meaning: 1. Abbreviation for the Post Office 2. Written abbreviation for petty officer: 3. Abbreviation for .